Microstructure and magnetic properties of Li-Co ferrites

The microstructure and magnetic properties of Li 0.5− x/2 Co x Fe 2.5− x/2 O 4 (where x=0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7) ferrites have been reported. The ferrite samples were prepared by standard double sintering ceramic technique and structural analysis was carried out using X-ray diffraction. Th...

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Published inMaterials chemistry and physics Vol. 65; no. 2; pp. 173 - 177
Main Authors Watawe, S.C, Sarwade, B.D, Bellad, S.S, Sutar, B.D, Chaugule, B.K
Format Journal Article
LanguageEnglish
Published Elsevier B.V 14.07.2000
Subjects
Ceramic technique
Ferrites
Saturation magnetization
Ferrites
Ceramic technique
Saturation magnetization
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Summary:The microstructure and magnetic properties of Li 0.5− x/2 Co x Fe 2.5− x/2 O 4 (where x=0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7) ferrites have been reported. The ferrite samples were prepared by standard double sintering ceramic technique and structural analysis was carried out using X-ray diffraction. The lattice parameter ( a) increases with increase in x. The average grain size obtained from SEM micrographs shows an initial decrease up to x=0.4 and then it increases. The saturation magnetization ( M s) and initial permeability ( μ i) decrease with cobalt content up to x=0.4 and then a small increase is observed in case of μ i. This has been attributed to high positive value of anisotropy constant ( k 1) for Co 2+. The Curie temperature of the samples decreases with increase in the content of cobalt ( x) due to reduction in the A–B interaction. The initial permeability of the samples remains almost independent of frequency in the frequency range studied viz. 1 kHz to 1 MHz. The measurement of AC susceptibility with temperature reveals the single domain (SD) state of the samples.
ISSN:0254-0584
1879-3312
DOI:10.1016/S0254-0584(00)00234-0